Bevel-protractor.



M. ZINSMAYEH. BEVEL PROTRACTOR. APPLICATION FILED MAR.18, 1914,

1, 1 25,628. Patented Jan. 19, 1915.

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BE'VELFPROTR-ACTOBQ I Application filed March-18,1914. Serial No. 325,599.

To all whom it may concern:

Be it known that I, hla'rnms ZINSMAYER, a citizen of the United States, residing at Cleveland, inthe county of Cuyahoga and State of Ohio, have invented'new and useful Improvements in Bevel-Protractors, of which the following isa specification.

This invention relates to bevel protractors, the primary object being to provide a device of this characterwhich includes an elongated, rectangular body which forms a handle, a movable blade connected pivotally and slidably with the body and readily operable and positive means whereby the blade may be adjusted angularly with respect to thebody and may be secured in adjusted position, irrespective of the sliding adjustment of the blade, whichis to increase or 7 decrease the effective length thereof.

construction,

A further object is to provide a device of the class set forth wherein the means for securing the movable blade in adjusted posi-' tion is of such character that the blade may be set at a predetermined angle accurately without observing the scale provided for the purpose. The device may thusbe used efficiently even after the scale has been rendered indistinct or has been obliteratedby long use and exposure to the deteriorating action of damp air or the like.

' The/invention consists in the features of combination, and arrangement of parts, hereinafter fully described and claimed, reference being had-to the accompanying drawings, in which:

Figure 1 is a side elevation of the device, showing the movable blade in itsinoperative" position, folded within the body slot; Fig. '2 is a longitudinal sectional view taken vertically through the device; Fig. 3 is a longitudinal sectional view. on line ',3-3 of Fig. 2; Fig. 4 is a transverse sectional view on line H of Fig. 1 Fig. 5 is a similar sectional'view on line 5-5 of Fig. 2; Fig; 6 is a top plan view of the device, showing the movable blade'in one of its ang'ularly adjusted, operative positions, other positions of the'blade being shown in dotted lines, Fig. 7 is a detail bottom plan Specification of letters Patent.

Patented Jan. 119, 1915.

view of the movable gear; and Fig.8 is a detail perspective view of the body of the device. 1 I

In the drawings, the numeral 1 designates the elongated rectangular body of the device which is provided in one of its side faces with a longitudinal recess 2, Fig. 5, whereby the weight of the body is reduced and it is adapted to be grasped more securely when being used. The opposite side face of the body is provided at oneend thereof with an enlargement 3 whose inner end face i is beveled at an angle of 4:5" to the longitudinal axis of the body. The body is adapted to be cast from aluminum, or some other light and durable metal, and a flat, resilient plate 5 of tempered steel or the like is secured to the outer side face of the body enlargement 3 detachably, as by means of the screws 6. This plate 5 extends 1011 gitudinally with respect to the body and is disposed normally in parallel relation to the adjacent side face thereof. The end of the body 1 adjacent to the free end of the plate 5 is provided in its inner face with a circular recess 7 which opens through the rounded end face of the body and is arranged with its axis at right angles to the longitudinal axis of the body. The corresponding end of the plate 5 is also rounded similar to the said end face of the body and both this plate and the body are provided with a-lining openings concentric with the recess 7, the body opening being threaded for the reception of one end of a detachable pivoting stud 8, whose opposite end projects through the plate opening and is threaded for the reception of a knurled. binding nut 9. A pair of coacting crown gears 10 and 11 are adapted to be mounted within the body adjust engagement with the adjacent face of a movable blade 13, which latter is mounted within the slot afforded between the body 1 and the plate 5. The said blade is con structed so as to fit completely within the said slot when in its inoperative position, as shown particularly in Figs. 1 to of the drawing, and is provided with a longitudinal slot 1 1 receiving the radially extending lug which is formed upon the outer fiat face of the crown gear 11. The fixed and movable crown gears are provided upon their outer peripheries with the cooperative scale 16 of angular measurement and an indicator line 16" respectively, which are inscribed thereonin any suitable manner, for use in determining the degree of angular adjustment of the movable blade. The blade is'also provided upon one of its side faces with a scale of linear measurement 1'? coextensive with its longer edge.

O'wing to the fact that the teeth of the crown gear have a pitch of 7 the movable blade 13 may be adjusted accurately to any of the ordinarily employed angles to the longitudinal axis of the body. The degree of adjustment may be determined by reference to the scales 16, and this operation is accomplished by merely turning the blade and the crown gear 11, which is rotatable therewith, upon the stud 8 as a pivot, after the binding nut 9 has been loosened upon the stud. The resilient plate 5, which normally tends to maintain the gear teeth in mesh, will thus be sprung laterally to release the movable gear and to permit the desired angular adjustment of the same. The limiting lug 15 carried by the movable gear is adapted to prevent pivotal movement of the blade 13 with respect to the said gear, but allows limited sliding movement thereof as is necessary in varying the effective length of the blade. The said lug is constructed slightly thinner than the movable blade in order that it will not contact with the resilient plate 5. Therefore, the nut 9 will force the plate end firmly against the movable blade alone, thereby binding the same effectively against sliding movement. The movable blade may thus be adjusted longitudinally and may be secured in adjusted position without affecting the angular relation of the same to the body.

The angular adjustment of the movable blade with respect to the body may be effected without reference to the scale, for, as the gear teeth slip past each other, they will make a clicking sound, by which the number of teeth slipped may be determined readily. For each click there will be an adjustment of 7 30, so, when it is desired to the movable blade 15 from any given position, two teeth will be slipped and consequently two sharp clicks will be audible.

v each.

5 so they may be constructed with 72 teeth If it 1s found desirable to use the instrument in drawing pentagons, each gear must be provided with 2 10 teeth, thereby having a pitch of 1 30.

From the foregoing description, taken in connection with the accompanying drawings, it. should be apparent that I haveprovided a bevel protractor which is extremely simp in construction, is composed of few parts. and is adapted to be used accurately and :mficiently by carpenters, and other artisan-s, in thewell known capacities of such aninstrument. V

What is claimed is 1. A bevel protractor comprising a body, a transverse pivot stud provided within the body, .a movable blade mounted upon the said stud for oscillatory and radial sliding movement thereon, a fixed crown gear mounted upon the body concentric with the stud, second crown gear mounted pivotally upon the stud and being adapted to mesh with the fixed gear, ing the movable blade with the'movable gear to prevent relative rotary movement thereof.

2. A bevel protractor comprising'a body, a transverse pivot stud provided within the body, a movable blade mounted upon the said stud for oscillatory and radial sliding movement thereon, a fixed crown gear mounted upon the body concentrically with the stud, a second crown gear mounted pivotally upon the stud and being adapted to mesh with the fixed gear, means for connecting the movable blade with the movable gear to prevent relative rotary movement thereof, and means for securing the movable blade against radial movement with respect to the movable gear.

8. A bevel protractor comprising a body, a lateral pivoting stud provided within the body, a crown gear mounted concentrically upon the said stud and being connected fixedly with the body, a second crown gear pivotally mounted upon the stud in mesh with the fixed gear, an elongated radially extending lug formed uponthe outer fiat face of .the movable gear, and a movableiblade mounted within the-body and having a longitudinal slot receiving the pivoting stud and the saidgear lug. a. 1

4. A bevel protractor comprising a body, a lateral pivoting stud provided within the body, a crown gear mounted concentrically upon the said stud and being connected fixand means for connect-V edly With the body, a second crown gear pivable blade against radial movement with reotally mounted upon the stud in mesh With spect to the movable gear. 10 the fixed gear, an elongated radially extend- In testimony whereof I aifiX my signature ing lug formed upon the outer flat face of in presence of two Witnesses.

the movable gear, a movable blade mounted MATHIAS ZINSMAYER. Within the body and having a longitudinal Witnesses:

slot receiving the pivoting stud and the said F. FAULKLEY,

gear lug, and means for securing the Inov- ANNA M. MoLrroIms.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

